US President Donald Trump led a moment of silence in a brief, somber ceremony at the White House on Monday to mark the 16th anniversary of the September 11 terrorist attacks in New York, Washington and Pennsylvania.

Trump and First Lady Melania Trump walked onto the South Lawn and stood as bells tolled for the first 9/11 anniversary of Trump's presidency. They then bowed their heads and stood silently before placing their hands on their hearts as a bugler played "Taps."

They will attend a memorial ceremony at the Pentagon later on Monday morning, the Washington Post reported.

Vice President Mike Pence travelled to Shanksville, Pennsylvania, where one of the four hijacked jetliners crashed after passengers overpowered the hijackers. Two planes hit and destroyed the World Trade Centre in New York and the other crashed into the Pentagon on September 11, 2001.